- gamma fibers
- any A fibers that conduct at velocities of 15 to 40 meters per second and range from 3 to 7 μm in diameter; the only such fibers are the fusimotor fibers. See also under loop and motoneuron.
Medical dictionary. 2011.
gamma fibers
Look at other dictionaries:
gamma loop — a three part reflex arc consisting of gamma motoneurons that send impulses along the gamma fibers to the intrafusal fibers, causing the muscle spindle to contract; that in turn excites afferent impulses, which pass through the posterior root to… … Medical dictionary
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gamma motoneurons — neurons of the anterior spinal cord that give rise to the gamma (fusimotor) fibers which innervate intrafusal fibers of the muscle spindle. Cf. anterior horn cell and gamma loop … Medical dictionary
A fibers — myelinated afferent or efferent fibers of the somatic nervous system having a diameter of 1 to 22 μm and a conduction velocity of 5 to 120 meters per second; they include the alpha, beta, delta, and gamma fibers … Medical dictionary
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fusimotor fibers — efferent A fibers that innervate the intrafusal fibers of the muscle spindle; see also gamma f s. Called also fusimotor axons … Medical dictionary
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Granit , Ragnar Arthur — (1900–1991) Finnish neurophysiologist Born in the Finnish capital of Helsinki, Granit qualified as a physician from the university there in 1927. He taught at the university from 1927 until 1940, serving as professor of physiology from 1935. In… … Scientists
Muscle spindle — Latin fusus neuromuscularis Code TH H3.11.06.0.00018 Muscle spindles are sensory receptors within the belly of a muscle, which primarily detect changes in the length of this muscle. They convey length information to the central nervous system via … Wikipedia
